【摘 要】
：
在适宜直播的区域,选择苗期耐寒品种,适时早播利于延长生育期,保障后期籽粒灌浆及安全成熟.选用龙粳31、龙粳29和龙粳53共3个品种,以常规播期为对照,采用分期提前播种方法(间
【机 构】
：
黑龙江省农业科学院水稻研究所,佳木斯154026;黑龙江省农业机械工程科学研究院佳木斯农业机械化研究所,佳木斯154004
论文部分内容阅读
在适宜直播的区域,选择苗期耐寒品种,适时早播利于延长生育期,保障后期籽粒灌浆及安全成熟.选用龙粳31、龙粳29和龙粳53共3个品种,以常规播期为对照,采用分期提前播种方法(间隔3d),测定出苗率、秧苗素质及生物积累量,并计算根冠比和壮苗指数等.结果 表明,播期提前对不同品种的影响存在差异,龙粳53壮苗指数高、根冠比大、苗期耐寒性好,出苗率、秧苗素质和生物积累量与常规播期均无显著差异,具有根系活力强、扎根深及早生快发等优点,更适于直播生产.应选择苗期耐寒性好的品种适时提前播期,以延长直播稻有效生育期,但播期提前天数不宜过长.
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